![]() Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License. Figure 4.4.1: Diffraction from a double slit. We recommend using aĪuthors: Paul Peter Urone, Roger Hinrichs Use the information below to generate a citation. In the case of diffraction at more than two slits with equal spacings d, the positions of the interference maxima remain the same. Double-slit diffraction is the visible pattern that results from interference. Then you must include on every digital page view the following attribution: Double-slit interference occurs between waves because the waves are out of phase and interfere with each other. If you are redistributing all or part of this book in a digital format, Then you must include on every physical page the following attribution: If you are redistributing all or part of this book in a print format, Want to cite, share, or modify this book? This book uses the However, when rays travel at an angle θ θ size 12, and we see that a destructive minimum is obtained when this distance is an integral multiple of the wavelength. When they travel straight ahead, as in Figure 27.22(a), they remain in phase, and a central maximum is obtained. In particular, the center bright spot is much larger than it would be for double slits with the same width. (Each ray is perpendicular to the wavefront of a wavelet.) Assuming the screen is very far away compared with the size of the slit, rays heading toward a common destination are nearly parallel. If we compare single-slit diffraction to the double-slit interference pattern, the spots are much larger and more spread out. These are like rays that start out in phase and head in all directions. The purple line with peaks of the same height are from the interference of the waves from two slits the blue line with one big hump in the middle is the diffraction of waves from within one slit and the thick red line is the product of the two, which is the pattern observed on the screen. According to Huygens’s principle, every part of the wavefront in the slit emits wavelets. Figure 4.4.1: Diffraction from a double slit. ![]() Experiment with diffraction through elliptical, rectangular, or irregular apertures. ![]() Here we consider light coming from different parts of the same slit. Put up a barrier to explore single-slit diffraction and double-slit interference. The analysis of single slit diffraction is illustrated in Figure 27.22. (b) The drawing shows the bright central maximum and dimmer and thinner maxima on either side. The central maximum is six times higher than shown. Monochromatic light passing through a single slit has a central maximum and many smaller and dimmer maxima on either side. ![]() Figure 27.21 (a) Single slit diffraction pattern. ![]()
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